A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.
For puzzles based around the game 0hh1, found at 0hh1.com: a grid logic game in which you must deduce which tiles are blue and which are red. Related to 0hn0, which is made by the same people.
For puzzles based around the game 0hno, found at 0hn0.com: a grid logic game in which you must deduce which dots are blue and which are red. Related to the game 0hh1 made by the same people.
A puzzle in which certain letters, e.g. of each word, line, or paragraph, form a meaningful word or words when put together.
A mathematical puzzle centered around the manipulation and solution of equations.
A puzzle related to algorithmics (a main concept in computer science).
Alphametic puzzles involve equations where digits have been replaced with letters.
a game, usually online, involving puzzles and ciphers hidden in mysterious videos, images or audio with a story behind them. Usually it is meant to promote a product.
An anagram rearranges the letters of a word or phrase to produce a new word or phrase.
For puzzles related to or involving animals. This tag is not to be used for questions about animals.
For puzzles involving addition, subtraction, multiplication, or division.
A puzzle that makes use of astronomical knowledge, such as the names and positions of stars and planets.
In a 'blackboard puzzle' a set of numbers is transformed according to certain rules.
For questions related to the puzzle of islanders who can only leave when they deduce the colour of their own eyes.
a game that involves counters or pieces moved or placed on a "board" according to a fixed set of rules.
A bongard consists of mainly 6 boxes on the left and 6 boxes on the right. The task of a bongard problem is to discover a statement that describes the contents of each box on the left side, but does n…
an interlocking puzzle consisting of several three-dimensional pieces that are combined to make one three-dimensional unit.
A puzzle that involves numerical calculations, such as multiplication and addition.
A puzzle involving checkerboards: grids of squares alternating black and white in color, most commonly an 8x8 board.
A puzzle that makes use of chemical knowledge, such as the names and atomic numbers of chemical elements.
A puzzle related to the game of chess. Questions about chess which aren't puzzles are off-topic but can be asked on Chess Stack Exchange.
a simple method of modifying messages to make them unreadable, but still possible to recover. Common ciphers are Caesar, Vigenere, Atbash, and several types of substitution cipher. Other c…